Document Detail


Host cell golgi anti-apoptotic protein (GAAP) and growth of Chlamydia pneumoniae.
MedLine Citation:
PMID:  23000903     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Chlamydia pneumoniae protein CPn0809 is a type three secretion system substrate, the exact function of which in infection pathogenesis has remained unknown. In this study, we identified by yeast two-hybrid screening a potential host cell interaction partner of CPn0809, Golgi anti-apoptotic protein (GAAP), a conserved protein found in eukaryotic cells. GAAP gene is expressed at relatively constant levels and its expression remained stable also after C. pneumoniae infection. The interaction between GAAP and C. pneumoniae was suggested by transfection studies. GAAP knock-down by siRNA in infected A549 cells resulted in an increased number of C. pneumoniae genomes and growth of the bacteria as judged by quantitative PCR and inclusion counts, respectively. Silencing of GAAP did not make the A549 cells more susceptible to apoptosis per se, and infection with C. pneumoniae prevented staurosporin-induced apoptosis also in transfected cultures. Taken together, the proposed interaction between C. pneumoniae and GAAP modulates bacterial growth in A549 cells.
Authors:
Eveliina Markkula; Jaakko Hulkkonen; Tuula Penttilä; Mirja Puolakkainen
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-9-20
Journal Detail:
Title:  Microbial pathogenesis     Volume:  -     ISSN:  1096-1208     ISO Abbreviation:  Microb. Pathog.     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-9-24     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8606191     Medline TA:  Microb Pathog     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier Ltd. All rights reserved.
Affiliation:
Haartman Institute, Department of Virology, PO Box 21, FI-00014 University of Helsinki, Finland.
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